/* 基础样式重置 */
    body, h1, h2, h3, p, ul, li {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }

    /* ------------------------ 通用字体和颜色变量 ------------------------------------- */
    :root {
        --primary-color: #0f403f;
        --text-color-light: #ffffff;
    }

    body {
        /* 字体统一设置 */
        font-family: Arial, "Helvetica Neue", Helvetica, sans-serif;
        color: #333;
    }

    /* ==================== 1. Banner 样式 ==================== */

    .banner-container {
        position: relative;
        width: 100%;
        min-height: 250px;
        color: #ffffff;
        overflow: hidden;
    }

    /* 默认 30% 透黑遮罩 */
    .banner-container::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0, 0, 0, 0.2);
        z-index: 1;
        pointer-events: none;
    }

    /* 图片样式 */
    .banner-image {
        display: block;
        width: 100%;
        height: auto;
        min-height: 250px;
        max-height: 600px;
        object-fit: cover;
        object-position: center;
    }

    /* 文字内容区域 */
    .banner-text {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        z-index: 2;
        max-width: 90%;
        padding: 2rem 3%;
        text-align: center;
    }

    .banner-text h1 {
        /* 修正：确保 Banner 标题颜色为白色 */
        color: #ffffff;
        font-size: clamp(24px, 2.5vw, 36px);
        font-weight: 700;
        line-height: 1.3;
        margin-bottom: 0.5rem;
    }

    /* 【新增】按钮容器样式 */
    .banner-buttons {
        margin-top: 20px;
    }

    /* 【新增】通用按钮样式 */
    .banner-btn {
        display: inline-block;
        padding: 10px 25px;
        font-size: 18px;
        font-weight: 600;
        text-align: center;
        text-decoration: none;
        border-radius: 4px;
        cursor: pointer;
        transition: background-color 0.3s ease, border-color 0.3s ease;
        line-height: 1.5;
    }

    /* 【新增】主色按钮 (Primary Button) 样式 */
    .banner-btn.btn-primary {
        background-color: var(--primary-color);
        /* #0f403f */
        color: var(--text-color-light);
        border: 2px solid var(--primary-color);
    }
    .banner-btn.btn-primary:hover {
        background-color: #0c3332;
        /* 稍微深一点的颜色 */
        border-color: #0c3332;
    }


    /* ==================== 2. Story/Content Sections 样式 ==================== */

    .story-section {
        background-color: #ffffff;
        max-width: 1400px;
        margin: 0 0 20px 0;
        padding: 20px 20px 0 20px ;
        position: relative;
        z-index: 1;
    }
    
    .story-content-grid {
        display: flex;
        gap: 10px;
        align-items: center;
        padding: 30px 0;
    }

    .story-text-wrapper {
        flex: 1;
    }
    .story-image-wrapper {
        flex: 0 0 45%;
        max-width: 45%;
        overflow: hidden;
    }

    .reverse-layout .story-text-wrapper {
        order: 2;
    }
    .reverse-layout .story-image-wrapper {
        order: 1;
    }

    .material-title {
        font-size: 28px;
        font-weight: 700;
        color: #333;
        margin-bottom: 15px;
    }

    .story-paragraph {
        font-size: 18px;
        line-height: 1.7;
        color: #666;
        margin-bottom: 15px;
    }

    .story-image {
        display: block;
        width: 85%;
        height: auto;
        max-width: none;
        object-fit: cover;
        margin-left: auto;
        margin-right: auto;
    }
    
    .reverse-layout .story-image {
        margin-left: 0;
        margin-right: auto;
    }

    .story-btn-wrapper {
        margin-top: 20px;
    }


    /* ==================== 3. 缩略图样式与 Hover 效果 (修正尺寸和对齐逻辑) ==================== */

    .material-thumbnails {
        display: flex;
        justify-content: center;
        /* 保持这个 gap 与您原有的图片间隙一致，这里是 30px */
        gap: 30px; 
        padding-bottom: 30px;
        position: relative;
        z-index: 10;
    }

    .thumb-item {
        position: relative;
        /* PC 端：保持这个宽度与图片容器宽度一致，以控制对齐 */
        width: 18%; 
        flex-shrink: 0;
        cursor: pointer;
        padding: 0; 
        margin-bottom: 20px;
        border: 3px solid transparent;
        transition: all 0.3s ease;
    }

    .thumb-item:hover {
        border-color: transparent;
    }
    
    .thumb-link {
        display: block;
        position: relative;
        width: 100%; /* 图片容器占据整个 thumb-item 的宽度 */
        height: 180px; 
        max-height: 240px;
        overflow: hidden;
        text-decoration: none;
        color: #ffffff;
    }

    .thumb-image {
        display: block;
        width: 100%;
        height: 100%;
        object-fit: cover;
        position: static;
    }

    .thumb-link::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0, 0, 0, 0.3);
        opacity: 0;
        z-index: 1;
        pointer-events: none;
        transition: opacity 0.3s ease;
    }

    .thumb-item:hover .thumb-link::before {
        opacity: 1;
    }

    .thumb-text {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        font-size: 18px;
        font-weight: bold;
        text-align: center;
        padding: 5px;
        z-index: 2;
        opacity: 0;
        white-space: nowrap;
        transition: opacity 0.3s ease;
    }

    .thumb-item:hover .thumb-text {
        opacity: 1;
    }

    /* 【PC 端按钮样式】：保留您强制的设置 */
    .thumb-item .story-btn-wrapper {
        margin-top: 15px;
        width: 86%; /* 用户强制保留 */
    }
    .thumb-item .story-btn-wrapper .banner-btn {
        padding: 8px 15px;
        font-size: 14px;
        display: block; 
        width: 100%; /* PC 端：精确对齐按钮容器宽度 */
        margin: 0;
    }


    /* ==================== 响应式设计 ==================== */
    @media (max-width: 768px) {
        .story-section {
            padding: 20px;
            margin-bottom: 40px;
        }
        
        .story-content-grid {
            flex-direction: column;
            gap: 25px;
            padding: 0;
        }

        /* 【修改点】：调整移动端内容主图尺寸 */
        .story-image-wrapper {
            flex: none;
            width: 100%; /* 确保占据完整宽度 */
            max-width: 100%;
            order: 1;
            height: 250px; /* 增大图片显示高度 */
            overflow: hidden;
        }
        .story-image {
            width: 100%;
            height: 100%;
            margin-left: auto;
            margin-right: right;
            object-fit: cover; /* 确保图片覆盖整个新尺寸的区域 */
        }

        .story-text-wrapper {
            flex: none;
            width: 100%;
            order: 2;
        }
        
        .reverse-layout .story-text-wrapper {
            order: 2;
        }
        .reverse-layout .story-image-wrapper {
            order: 1;
        }

        /* 关键修改区域：缩略图改为每行 1 个（单列显示） */
        .material-thumbnails {
            flex-wrap: wrap;
            justify-content: center; /* 确保单列元素居中 */
            gap: 20px; /* 增大垂直间距 */
            padding-bottom: 20px;
        }
        .thumb-item {
            width: 100%; /* 占据 100% 宽度实现单列 */
            margin-bottom: 0; /* 垂直间距由 gap 控制 */
        }
        /* 移除多列布局时留下的 nth-child(5) 居中样式 */
        .thumb-item:nth-child(5) {
            margin-left: initial;
            margin-right: initial;
        }
        
        .thumb-link {
            height: 180px; /* 调整为更合适的高度 */
            max-height: 240px;
        }
        .thumb-text {
            font-size: 16px;
        }
        
        .story-btn-wrapper {
            margin-top: 15px;
            width: 100%;
        }
        /* 【移动端按钮样式】：保留您强制的设置 */
        .thumb-item .story-btn-wrapper .banner-btn {
            font-size: 14px;
            padding: 6px 15px;
            display: block; /* 确保按钮是块级元素 */
            width: 106%; /* 用户强制保留 */
        }
    }